Hello !
I am trying to model the operation of a DC connected PV+Battery system, where the battery is charged from the clipped energy and does energy arbitrage (buy low, sell high)
I understand that arbitrage does not work best with SAM, and that there is a way to model it using a PPA price of 1usd/kWh and use ToD reflecting spot prices (which I have done)
My issue is the following : when comparing the case where the battery is only charged with clipped energy and the case where the battery can also charge from the grid, the results are a bit hard to understand. Specifically, the battery cahrges higher from the system in the case where grid charging is allowed versus the case when that is not allowed. Anyone know the reason for that ?
Attached the SAM file. The first simulation (Tierp_Clipping_with arbitrage) is the one where both charging from system and grid is allowed, while the other one charging is only from clipped energy. Take a look for example at Jun12/13 to see the difference i mention.
Best regards